#include <iostream>
using namespace std;
class Person{
    public:
    string name;
    int age;
    PErson(string n, int a){
        name = n;
        age = a;
    }
    Person operator++(){
        ++age;
        return*this;
}
};
int main(){
    string name;
    int age;
    cin>>name;
    cin>>age;
    if(age<0){
        cout<<"Invalid input";
        return 0;
    }
    person p(name, age);
    ++p;
    cout<<p.name<<":"<<p.age;
    return 0;
}