#include <stdio.h>
#include <stdlib.h>

#define MAX 50

void PrintIt(int Array[], int k) {
  int i;
  
  for (i = 0; i < k; i ++) printf(" %d", Array[i]);

  printf("\n");
}

void Combs(int Array[], int n, int k, int pos, int low) {
  int i;

  if (pos >= k) PrintIt(Array, k);
  else {
    for (i = low + 1; i <= n - k + pos + 1; i ++) {
      Array[pos] = i;
      Combs(Array, n, k, pos + 1, i);
    }
  }
}

int main(int argc, char *argv[]) {
  int n, k, i;
  int B[MAX];
  
  if (argc != 3) {
    printf("\n Two arguments expected.\n");
    return 1;
  }

  k = atoi(argv[1]);
  n = atoi(argv[2]);

  if (n < 0 || k < 0) {
    printf("\n Positive numbers expected.\n");
    return 2;
  }

  if (n > MAX || k > MAX) {
    printf("\n Numbers not greater than %d expected.\n", MAX);
    return 3;
  }

  if (k > n) {
    printf("\n The first number must not be greater than the second number.\n");
    return 4;
  }

  Combs(B, n, k, 0, 0);
  
  return 0;
}