a=int(input())
b=a//1000;
c=(a//100)%10;
d=(a//10)%10;
e=a%10;
print(e*1000+d*100+c*10+b)
/**************************************************************
	Problem: 1029
	User: admin
	Language: Python
	Result: Accepted
	Time:93 ms
	Memory:34244 kb
****************************************************************/