#include<iostream>
#include <sstream>
#include <algorithm>
#include <vector>
using namespace std;

unsigned int getMinDigitAtNaturalNumber(const unsigned int natural_number)
{
    unsigned int min_digit = natural_number % 10;
    int cutted_number = natural_number / 10;
    while(cutted_number != 0)
    {
        if((cutted_number % 10) < min_digit)
        {
            min_digit = cutted_number % 10;
        }
        cutted_number /= 10;
    }

    return min_digit;
}

int main() {

    unsigned int natural_number = 0;
    cin >> natural_number;
     vector <int> mas;
    int c = 0;

    int size = sizeof(mas)/sizeof(mas[0]);

    int b = getMinDigitAtNaturalNumber(natural_number);
    for(int i=0;natural_number!=0;i++)
       {mas.push_back(natural_number%10); natural_number/=10; c++;};

       int count = 0;

    for(int i=c-1;i>=0;i--)
    if(mas[i] == b && count < 1)
    {
        count++;
    }
    else {
    cout<<mas[i];
    }



    }