#include <iostream>
#include <string>
using namespace std;
int main(){
    string s;
    cin>>s;
    s.erase(remove(s.begin() , s.end(), ::isspace), s.end());
    for(int i=0;i<s.length();i++){
        if(s[i]==' ' && s[i]=='0' && s[i]=='1' && s[i]=='2' && s[i]=='3' && s[i]=='4' && s[i]=='5' && s[i]=='6' && s[i]=='7' && s[i]=='8' && s[i]=='9'){
            cout<<"Invalid input";
        }
    }
    cout<<s;
    return 0;
}