/******************************************************************************
 *  Compilation:  javac Squeeze.java
 *  Execution:    java Squeeze
 *  Dependencies: In.java
 *
 *  Takes a string command line argument and removes adjacent spaces.
 *
 *  % java Squeeze "this is    a    test"
 *  this is a test
 *
 ******************************************************************************/

public class Squeeze {
    public static String squeeze(String s) {
        char[] a = s.toCharArray();
        int n = 1;
        for (int i = 1; i < a.length; i++) {
            a[n] = a[i];
            if      (a[n]   != ' ') n++;
            else if (a[n-1] != ' ') n++;
        }
        return new String(a, 0, n);
    }


    public static void main(String[] args) {
        StdOut.println(squeeze(args[0]));
    }

}