func_code_string: #include <bits/stdc++.h>   int v[1000001];   using namespace std;   int main() {     int a, b, c, d;     scanf( %d%d%d%d , &a, &b, &c, &d);     while (b <= 1000000) {       v[b] = 1;       b += a;     }     while (d <= 1000000) {       if (v[d] == 1) {         printf( %d , d);         return 0;       }       d += c;     }     printf( -1 );     return 0;   }   