from datetime import datetime, timedelta

a, b, S = input().split(' ')

# まず UTC 時間に戻す
src = datetime(2000, 1, 1, int(a), int(b))
utc = src - timedelta(hours=9)

# 演算子と数値を位置で取得
operator = S[3]  # + or -
sub = S[4:]  # 整数か小数

# 差分を足す
if operator == '+':
    dst = utc + timedelta(hours=float(sub))
elif operator == '-':
    dst = utc - timedelta(hours=float(sub))
else:
    raise AssertionError

# 出力
print(dst.strftime('%H:%M'))