#include<bits/stdc++.h> using namespace std; string s; char p; int ans=0; int main(){ cin>>s>>p; for(int i=0;i<=s.length();i++){ if(p-'0'>s[i]-'0'){ s[i]=p; break; } } for(int i=0;i<=s.length();i++){ ans=s[i]-'0'; cout<<ans; } }