#include <stdio.h>

// Function prototypes
void swap(int *a, int *b);

int main(void) {
  // Initialize variables
  int n;
  int length = 0;
  int nums[10];

  // Get input
  scanf("%d", &n);

  // Tabulate nums[]
  while (n > 0) {
    nums[length] = n % 10;
    n /= 10;
    length++;
  }

  // See if anything is wrong
  if (nums[0] == 0) {
    printf("The number cannot be changed.\n");
  } else { // Print answer
    for (int i = 0; i < length; i++) {
      printf("%i", nums[i]);
    }
		printf("\n");
  }
  return 0;
}