using System;
using System.Text;
public class Test
{
public static void Main()
{
string s = "Stack Overflow";
StringBuilder sb = new StringBuilder();
for(var i = s.Length-1; i>=0; i--)
{
sb.Append(s[i]);
}
Console.WriteLine(sb.ToString());
}
}
dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uVGV4dDsKCnB1YmxpYyBjbGFzcyBUZXN0CnsKCXB1YmxpYyBzdGF0aWMgdm9pZCBNYWluKCkKCXsKCQlzdHJpbmcgcyA9ICJTdGFjayBPdmVyZmxvdyI7CgkJU3RyaW5nQnVpbGRlciBzYiA9IG5ldyBTdHJpbmdCdWlsZGVyKCk7CgkJZm9yKHZhciBpID0gcy5MZW5ndGgtMTsgaT49MDsgaS0tKQoJCXsKCQkgICAgc2IuQXBwZW5kKHNbaV0pOwoJCX0KCQlDb25zb2xlLldyaXRlTGluZShzYi5Ub1N0cmluZygpKTsKCX0KfQ==