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

class Person {
private:
    string name;
    int age;
    
public:
   person(string n, int a) : name(n),age(a) {}
   
   Person& operator++() {
       if (age >= 0 && age < 120) {
           age++;
       }
       return *this;
    }
    
    void display() {
        cout << nmae <<":" << age << endl; 
    }
};

int main() {
    string name;
    int age;
    
    cin >> name >>age;
    
    if (age < 0 || age > 120) {
        cout << "Invalid input" << endl;
        return 0;
    }
    
    Person p(nmae, age);
    
    ++p;
    
    
    p.display()
    
    
    return 0;
}