#include <iostream>
#include <cstring>
using namespace std;

int main()
{
    string sch;
    char sample[30];
    char y, t;
    int a, max = 1;
    for(char t = 'a'; t <= 'z'; t++)
    {
        sample[t]=t;
    }
    cin>>sch;
    for (char j = 'a'; j <= 'z'; j++)
    {
        a = 0;
        for (int i = 0; i<=sch.length(); i++)
        {
            if(sch[i]=='\0')
            {
            if (a!=0){
            if (max < a)
                {
                max = a;
                cout<<y<<"="<<a<<endl;}
            }}

            if (sch[i]==sample[j])
            {
                a++;
                y = sch[i];
                }
            }
        }
    return 0;
}