a,rest=input().split() shi,fen=map(int,a.split(':')) shi1=shi+int(rest)//60 fen1=int(rest)-60*(int(rest)//60)+fen while shi1>24: shi1=shi1-24 while fen1>60: fen1=fen1-60 shi1=shi1+1 print(f"{shi1:02d}:{fen1:02d}")