massage = '''
將一個四位數，反向輸出
'''

N = input()
print(N[::-1])
# 輸入：	1245
# 輸出 ：5421

#!/usr/bin/env python3
#-*- coding:utf-8 -*-
from functools import reduce
#---------------------
def returnReverseNumberString(ls):
    ls.reverse()
    return reduce(lambda x,y:x+y,ls)
    
def returnNumberCharList(x):
    resultList=[]
    for temp in x:
        resultList.append(temp)
    return resultList

def main():
    try:
        number=input()
        print(f"{eval(returnReverseNumberString(returnNumberCharList(number)))}")
    except Exception as e:
        print("The data's type of inputing is bad!")
        print("Error:",e)
    finally:
        pass
#---------------------
main()