T = [int(i) for i in input().split(":")]
T[1] += 5
H = 0
M = 0
if T[1] >= 60:
    T[0] += 1
    T[1] -= 60
    if T[0] == 24:
        T[0] = 00
if T[0] < 10:
    H = "0"+str(T[0])
else:
    H = str(T[0])
if T[1] < 10:
    M = "0"+str(T[1])
else:
    M = str(T[1])
print(H+":"+M)