A,B = map(int,input().split(":"))

B += 5
if B >= 60:
	A += 1
	B -= 60
if A == 24:
	A = 0
A = str(A)
B = str(B)
if len(A) == 1:
	A = "0"+A
if len(B) == 1:
	B = "0"+B
print(A + ":" + B)