import java.io.*;
class swaping
{
public static void main(String args[])
{
String name="premkumarg";
int len=name.length();
char[] c = name.toCharArray();
for(int i=0;i<len-1;i=i+2)
{
char temp= c[i];
c[i]=c[i+1];
c[i+1]=temp;
}
System.out.println("Swapping string is: ");
System.out.println(c);
}
}