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

int main(){
    string a;
    cin>>a;
    string result= "";
    if(a.length() >= 1 && a.length <=100){
        for(int i=0; i<a.length(); i++)
        if(isdigit(a[i])){
            result += 
        }
    }
    
    if(result.length()==0){
        cout<<"-1";
    }
    return 0;
}