题解 | #小乐乐定闹钟#
小乐乐定闹钟
https://www.nowcoder.com/practice/0f7e422e12be4a7f9958ca2a82abc775
a = input().split()
b = a[0].split(':')
c = int(a[1])
x = c // 60 + int(b[0])
y = c % 60 + int(b[1])
if y > 60:
y -= 60
x += 1
x %= 24
print('{:02d}:{:02d}'.format(x,y))
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