// editor2
#include<iostream>
#include<string>
using namespace std;
int main(){
    string s;
    cin>>s;
    int count = 0;
    for(char c : s){
        if(!(isalpha(c)){
            cout<<c;
            count++;
        }
    }
    if(count == 0){
        cout<<"-1";
    }
    
}