using System;
public class Program
{
public static void Main()
String s="sabya sachi nayak";
Console.WriteLine(s);
s=" "+s;
//Console.Write(s.Substring(0,1).ToUpper()+".");
for(int i=0;i<s.Length;i++)
if(s[i].Equals(' '))//s[i] instead of s.charAt(i)
Console.Write(s.Substring(i+1,1).ToUpper()+".");
i++;
}