Fridge

#include <bits/stdc++.h>
#define F first
#define S second
#define X real()
#define Y imag()
using namespace std;
typedef long long ll;
typedef long double ld;

int t[22];

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	string s;
	cin>>s;
	for (char c:s){
		t[c-'0']++;
	}
	int mi=1e9;
	int mt=0;
	for (int i=1;i<=10;i++){
		int x=i%10;
		if (t[x]<mi){
			mi=t[x];
			mt=x;
		}
	}
	if (mt==0){
		cout<<1;
	}
	for (int i=0;i<=mi;i++){
		cout<<mt;
	}
	cout<<endl;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED