# Read the input time
t = input().strip()
# Split into hours and minutes
h_str, m_str = t.split(':')
h = int(h_str)
m = int(m_str)

# Calculate total minutes after adding 5 minutes
total_minutes = h * 60 + m + 5

# Compute new hours and minutes
new_h = (total_minutes // 60) % 24
new_m = total_minutes % 60

# Format the result with leading zeros
print("{:02d}:{:02d}".format(new_h, new_m))