FourSquare

#include <bits/stdc++.h>
using namespace std;
ifstream fin("foursquare.in");
ofstream fout("foursquare.out");
char a1[6][6], a2[6][6], a3[6][6], a4[6][6], s[10001], ans[10001];
struct index
{
     int x, y;

};

struct index findIndex1(char mat[6][6], char ch)
{
       int i, j;
       struct index f;
       for(i=0;i<5;i++)
       {
              for(j=0;j<5;j++)
              {
                     if(mat[i][j]==ch)
                     {
                           f.x = i;
                           f.y = j;
                           i=5;
                           j=5;
                     }
              }
       }
       return f;
}
void encrypt(int l)
{

       int i, ax, ay, bx, by;
       struct index f;
       for(i=0; i<l; i=i+2)
       {
              f = findIndex1(a1, s[i]);
              ax = f.x;
              ay = f.y;
              f = findIndex1(a4, s[i+1]);
              bx = f.x;
              by = f.y;
              ans[i] = a2[ax][by];
              ans[i+1] = a3[bx][ay];
              fout<<ans[i]<<ans[i+1];
       }
}

int main()
{
    int i;
    for(i=0; i<5; i++)
        fin>>a1[i];
    fin.get();
    for(i=0; i<5; i++)
        fin>>a2[i];
    fin.get();
    for(i=0; i<5; i++)
        fin>>a3[i];
    fin.get();
    for(i=0; i<5; i++)
        fin>>a4[i];
    fin.get();
    fin.getline(s, 10001);
    unsigned int ls=strlen(s);
    encrypt(ls);
    return  0;
}