func_code_string: #include <bits/stdc++.h>   using namespace std;   long long gcd(long long a, long long b) {     while (a) b %= a, swap(a, b);     return b;   }   char x[1000005], y[1000005];   int aux[1000005][26];   int main() {     long long n, m;     cin >> n >> m;     scanf( %s %s , x, y);     int lenx = strlen(x), leny = strlen(y);     long long mdc = gcd(lenx, leny);     long long mmc = lenx / mdc * leny;     long long diff = mmc;     for (int i = (0); i < (leny); ++i) ++aux[i % mdc][y[i] -  a ];     for (int i = (0); i < (lenx); ++i) diff -= aux[i % mdc][x[i] -  a ];     cout << diff * (n * lenx / mmc) << endl;     return 0;   }   