chubrik_and_numero

/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/

#include <ctype.h>
#include <stdio.h>

#define ULL unsigned long long
#define LL long long
#define uint unsigned int
#define uchar unsigned char

#define INV(x) ('9' - (x) + '0')

int main(void) {
  int ch;

  while (isspace(ch = getchar()))
    ; // whitespace skip

  do {
    if (INV(ch) < ch) {
      ch = INV(ch);
    }
    if (ch != '0') {
      break;
    }
  } while (!isspace(ch = getchar()) && (ch != EOF));

  if (isspace(ch) || (ch == EOF)) {
    putchar('9');
    putchar('\n');
    return 0;
  }

  do {
    if (INV(ch) < ch) {
      ch = INV(ch);
    }
    putchar(ch);
  } while (!isspace(ch = getchar()) && (ch != EOF));

  putchar('\n');

  return 0;
}