/* Compute interarrival time from an arrival time trace */

#include <stdio.h>

main()
  {
    float newtime, oldtime;

    scanf("%f\n", &oldtime);

    while( scanf("%f\n", &newtime) == 1 )
      {
	/* compute elapsed time from last arrival */
	printf("%8.6f\n", newtime - oldtime);
	
	/* record the new time */
	oldtime = newtime;
      }
  }