// THe program gets input from the user and prints it out 
// alternating uppercase and lowercase characters

// the program does not have if/else statement inside the loop

// need this import for reading data:
import java.io.*;

public class Alternate {

    public static void main (String [] args)  throws IOException {
	// Create a buffered reader
	// need only one buffered reader for all your reading
	BufferedReader in = new BufferedReader(
			new InputStreamReader(System.in));
	// string for storing a line of input
	String line;

	// Read one integer
	// prompt the user:
        System.out.print("Please enter a string: ");
	// read a line of input:
	line = in.readLine();
	String upper = line.toUpperCase();
	String lower = line.toLowerCase();

	int len = line.length();
	for (int i = 0; i < len - 1; i = i + 2) {
	    //System.out.print(upper.charAt(i));
	    System.out.print(Character.toUpperCase(upper.charAt(i)));
	    System.out.print(lower.charAt(i + 1));
	}
	if (len%2 == 1) {
	    System.out.print(upper.charAt(len - 1));
	}
    }
}