#include <stdio.h>

char *serial = "\x31\x3e\x3d\x26\x31";

int check(char *ptr) {
    int i = 0;
    while (i < 5){
        if (((ptr[i]) ^ 0x55) != serial[i]) 
            return 0;
        i++;
    }
    return 1;
}

int main() {
    char inp[72] = {0};
    scanf_s("%s", inp);
    if (check(inp) == 1) {
        printf("win");
    } else {
        printf("fail"); 
    }
    return 0;
}