#include <stdio.h>
#include <string.h>
main()
{
    char s[10050];
    int l, r, d;
    while(true){
        scanf("%s", s);
        if(strcmp(s, "end") == 0)
            return 0;
        l = strlen(s);
        r = 0;
        for(int i = 0; i < l; i++){
            if('0' <= s[i] && s[i] <= '9')
                d = s[i] - '0';
            else if('A' <= s[i] && s[i] <= 'Z')
                d = 10 + s[i] - 'A';
            else
                d = 36 + s[i] - 'a';
            r += d;
        }
        if(r % 61 == 0)
            printf("yes\n");
        else
            printf("no\n");
    }
}