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