dj

#include<bits/stdc++.h>
using namespace std;
int main(){
    string s;
    cin>>s;
    int a[26] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
    for(int i = 0;i<s.size();i++){
        a[s[i]-'a']++;
    }
    int maxn = 0;
    int ans = -1;
    for(int i = 25;i>=0;i--){
        if(a[i]>=maxn)
        {
            maxn = a[i];
            ans = i;
        }
    }
    char ansc = ans+'a';
    cout<<ansc;
}