#include<bits/stdc++.h> using namespace std; int main(){ int h,m,s,t; cin>>h>>m>>s>>t; s=s+t; m=m+s/60; s=s%60; h=h+m/60; m=m%60; h=h%24; if(h==0) cout<<12<<":"<<m<<":"<<s<<"am"; else if(1<=h&&h<=11) cout<<h<<":"<<m<<":"<<s<<"am"; else if(h==12) cout<<12<<":"<<m<<":"<<s<<"pm"; else cout<<h-12<<":"<<m<<":"<<s<<"pm"; return 0; }