func_code_string: #include <bits/stdc++.h>   char a[1001][1001];   int n, m;   int findG(int r) {     int i;     for (i = 0; i < m; i = i + 1)       if (a[r][i] ==  G ) return i;   }   int findS(int r) {     int i;     for (i = 0; i < m; i = i + 1)       if (a[r][i] ==  S ) return i;   }   int main() {     scanf( %d%d , &n, &m);     int N = n;     while (N--) {       scanf( %s , &a[N]);     }     int f[1001] = {0};     for (int l = 0; l < n; l++) {       int dif = findS(l) - findG(l);       if (dif < 0) {         printf( -1 );         return 0;       } else         f[dif] = 1;     }     int s = 0;     for (int d = 0; d < m; d++) s = s + f[d];     printf( %d , s);     return 0;   }   