#include<stdio.h>
#include<string.h>
#include<stdbool.h>
int n,i,mn=105,mx=-1;
char cnt[26],s[105];

bool isprime(int x){
    if(x<2)return false;
    for(int i=2;i*i<x;++i)
        if(x%i==0)return false;
    return true;
}

int main(){
    FILE* fr=fopen("word.in","r");
    FILE* fw=fopen("word.out","w");
    fscanf(fr,"%s",s);
    n=strlen(s);
    for(i=0;i<n;++i)if('a'<=s[i]&&s[i]<='z')++cnt[s[i]-'a'];
    for(i=0;i<26;++i)if(cnt[i]>0){
        if(cnt[i]<mn)mn=cnt[i];
        if(cnt[i]>mx)mx=cnt[i];
    }
    if(isprime(mx-mn))fprintf(fw,"Lucky Word\n%d",mx-mn);
    else fprintf(fw,"No Answer\n0");
    fclose(fr);
    fclose(fw);
}