§1.1 Your Ride Is Here

Always allocate one more byte for a string.
/*
ID: xiaqqai1
LANG: C
TASK: ride
*/
#include <stdio.h>
int main()
{
    char group[6], comet[6];
    char *s;
    int val1, val2;
   
    freopen("ride.in", "r", stdin);
    freopen("ride.out", "w", stdout);
   
    scanf("%s%s", group, comet);

    val1 = val2 = 1;
   
    for (s = group; *s; s++){
        val1 *= *s - 'A' + 1;
        val1 %= 47;
    }
    for (s = comet; *s; s++){
        val2 *= *s - 'A' + 1;
        val2 %= 47;
    }
    if (val1 == val2){
        printf("GO/n");
    }else{
        printf("STAY/n");
    }
    exit(0);
}