#include<iostream>
#include<string>
using namespace std;
int main(){
    string s;
    cin>>s;
    string period = s.subtr(8,2);
    string ch1 = s.subtr(2,1);
    string ch2 = s.subtr(5,1);
    if (ch1 != ":" || ch2 != ":"){
        cout<<"Invalid input";
        return 0;
    }
    int hh = stoi(s.subtr(0,2));
    string rest = s.subtr(2,6);
    if(period == "AM"){
        if(hh == 12) hh = 0;
    }else{
        if(hh != 12) hhh += 12;
    }
    if (hh<10) cout<<"0";
    cout<< hh << rest << endl;
    return 0;
}