#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int,int>;
const int N = 1e6+10;
int t,n,m,k,l,r,op,x,y;
int f[N];
bool flag;
string str;
char last;
int cnt,word;
void solve(){
    getline(cin,str);
    str.push_back(' ');
    for(char ch:str){
        if(isalpha(ch)){
            if(ch>='A'&&ch<='Z')ch+=32;
            cnt++;
            f[(int)ch]++;
        }
        if(ch==' '){
            if(last!=' ')word++;
        }
        last=ch;
    }
    x = *max_element(f+'a',f+'z');
    cout<<cnt<<"\n"<<word<<"\n";
    for(int i = 'a';i<'z';i++){
        if(f[i]==x){
            cout<<(char)(i)<<" ";
        }
    }
    cout<<"\n"<<x;
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);  
    solve();
    return 0;
}