using System;
public class Test
{
public static void Main(string[] args)
{
for(int i=1; i< int.Parse(args[0]))
{
int length = args[i].Length / 2;
args[i].Substring(length,length);
}
// your code here
}
}
dXNpbmcgU3lzdGVtOwoKcHVibGljIGNsYXNzIFRlc3QKewoJcHVibGljIHN0YXRpYyB2b2lkIE1haW4oc3RyaW5nW10gYXJncykKCXsKCQkKCQlmb3IoaW50IGk9MTsgaTwgaW50LlBhcnNlKGFyZ3NbMF0pKQoJCXsKCQkJaW50IGxlbmd0aCA9IGFyZ3NbaV0uTGVuZ3RoIC8gMjsKCQkJYXJnc1tpXS5TdWJzdHJpbmcobGVuZ3RoLGxlbmd0aCk7CgkJfQoJCQoJCS8vIHlvdXIgY29kZSBoZXJlCgl9Cn0=