Как мне исправить эту ошибку?

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#include<iostream>
#include<string>
#include<vector>
using namespace std;

const int CHARBOARDROWS = 7;
const int CHARBOARDCOLS = 5;

struct Input
{
    string userInput;
    int x;
    int y;
    int choice;
    int timeStep;
    int speed;
    int length;
};

Input info;

void displayBoard();
Input inputProcess();
void displayA(vector<vector<char>> , int , int);
void displayB(vector<vector<char>> , int , int);
void displayC(vector<vector<char>> , int , int);
void displayD(vector<vector<char>> , int , int);
void displayE(vector<vector<char>> , int , int);
void displayF(vector<vector<char>> , int , int);
void displayG(vector<vector<char>> , int , int);
void displayH(vector<vector<char>> , int , int);

int main()
{
    vector<vector<char>> letterA;
    letterA.resize(CHARBOARDROWS, vector<char>(CHARBOARDCOLS));
    vector<vector<char>> letterB;
    letterB.resize(CHARBOARDROWS, vector<char>(CHARBOARDCOLS));
    vector<vector<char>> letterC;
    letterC.resize(CHARBOARDROWS, vector<char>(CHARBOARDCOLS));
    vector<vector<char>> letterD;
    letterD.resize(CHARBOARDROWS, vector<char>(CHARBOARDCOLS));
    vector<vector<char>> letterE;
    letterE.resize(CHARBOARDROWS, vector<char>(CHARBOARDCOLS));
    vector<vector<char>> letterF;
    letterF.resize(CHARBOARDROWS, vector<char>(CHARBOARDCOLS));
    vector<vector<char>> letterG;
    letterG.resize(CHARBOARDROWS, vector<char>(CHARBOARDCOLS));
    vector<vector<char>> letterH;
    letterH.resize(CHARBOARDROWS, vector<char>(CHARBOARDCOLS));

    inputProcess();


    // TODO : USE WHILE OR IF TO APPLY IN CHOICES


    displayBoard();
    displayA(letterA,CHARBOARDROWS,CHARBOARDCOLS);

    return 0;
}

void displayBoard()
{
    vector<vector<char>>A;
    int numOfRows = 20;
    int numOfCols = 40;
    //if (!((info.y)>numOfRows) || !((info.x)>numOfCols))
    for (int i=0;i<info.length;i++)
    {
        if (info.userInput[i]=='A')
        {
            displayA(A,CHARBOARDROWS,CHARBOARDCOLS);
        }

    }
    for (int row=0;row<numOfRows;row++)
    {
        for (int column=0;column<numOfCols;column++)
        {
                cout<<'*';
        }
        cout<<"\n";
    }
}

Input inputProcess()
{
    //Input info;

    cout<<"Please input a string (can up to 25 character long) :\n";
    getline(cin,info.userInput);
    cout<<"\n*********************************************";
    cout<<"\nAnchor dot is the top left dot of the string.";
    cout<<"\n*********************************************";
    cout<<"\n\nPlease input coordinate x of anchor dot : \n";
    cin>>info.x;
    cout<<"\nPlease input coordinate y of anchor dot :\n";
    cin>>info.y;
    cout<<"\nPlease choose to display the string :";
    cout<<"\n1-scrolling from left to right";
    cout<<"\n2-scrolling from right to left";
    cout<<"\n3-scrolling upwards";
    cout<<"\n4-scrolling downwards";
    cout<<"\n5-stationary without scrolling\n\n"<<"INPUT :";
    cin>>info.choice;
    cout<<"\n*********************************************";
    cout<<"\nOne time step is one refresh cycle which is\n"
        <<"made up of a screen clearing process and a\n"
        <<"display process.";
    cout<<"\n*********************************************";
    cout<<"\n\nPlease input number of time steps :\n";
    cin>>info.timeStep;
    cout<<"\nPlease input speed (between 1 to 10) :\n";
    cout<<"1-the slowest\t 10-the fastest\n";
    cin>>info.speed;
    info.length = info.userInput.length();
    displayBoard();
}

void displayA(vector<vector<char>> A, int row, int column)
{
    A[0][2] = '#';
    A[1][1] = '#';
    A[1][3] = '#';
    A[2][0] = '#';
    A[2][4] = '#';
    A[3][0] = '#';
    A[3][4] = '#';
    A[4][0] = '#';
    A[4][1] = '#';
    A[4][2] = '#';
    A[4][3] = '#';
    A[4][4] = '#';
    A[5][0] = '#';
    A[5][4] = '#';
    A[6][0] = '#';
    A[6][4] = '#';
    for (auto val:A[0])
        cout<<val[0][val];
}

}

Что я уже пробовал:

1.Линии

cout<<val[0][val];

показывает ошибку, что недопустимые типы [char][int] для индекса массива.Как исправить эту ошибку.
2. или если есть другой способ печати вектора, кроме метода, который я использовал.

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