一、 a = input() b = a.split() b.reverse() c = ''.join(b) print(c) 二、 a = input() if 100 <= float(a) <1000: b = a.split() b.reverse() c = ''.join(b) print(c) 三、 a = float(input()) A = round(a, 1) if 100 <= A <1000: b = A.split() b.reverse() c = ''.join(b) print(c)