#include<stdio.h>
int main(void){
   double x[5], y[5], key, keyy, keyx;
   int i, n = 4;
   while ( scanf("%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf", &x[1], &y[1], &x[2], &y[2], &x[3], &y[3], &x[4], &y[4]) != EOF ) {
      n = key = 4;
      while ( n ) {
         for ( i = 1; i < key; i++ ) {
            if ( y[i] > y[i + 1]) {
               keyy = y[i + 1];
               y[i + 1] = y[i];
               y[i] = keyy;
               keyx = x[i + 1];
               x[i + 1] = x[i];
               x[i] = keyx;
            }
            key--;
printf("a");
            n--;
         }
      }
printf("b");
      for ( i = 1; i <= 4; i++ ) {
         printf("x[%d]:%lf y[%d]:%lf\n", i, x[i], i, y[i]);
      }
   }
   return 0;
}