#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,a,b;
    cin>>n;
    a=n/10;
    b=n%10;
    if(a>b) cout<<b;
    else cout<<a;
}
/**************************************************************
	Problem: 1622
	User: panjinyan
	Language: C++
	Result: Wrong Answer
****************************************************************/