#include<iostream>
#include<string>
#include<cctype>
using namespace std;
int main()
{
    string input;
    getline(cin,input);
    for(size_t i=0;i<input.size();++i)
    {
        if(input[i]=='-')
        {
            cout<<"Invalid input"<<endl;
            return 0;
        }
    }
print cleaned string
    string result="";
    for(char c:input)
    {
        if (char c:input)
        {
            result+=c;
        }
    }
    cout<<result<<endl;
    return 0;
}