L1-075 强迫症 python

python 实现

s=input()
year=s[:len(s)-2]
month=s[len(s)-2:len(s)]

if len(year)==4:
    print("{year}-{month}".format(year=year, month=month))
else:
    if int(year)<22:
        print("20{year}-{month}".format(year=year,month=month))
    elif int(year)<100:
        print("19{year}-{month}".format(year=year,month=month))