void addBig(int place, int carry, char (*grid)[50]) {
  int i, sum=carry;

  if (place < 0) {
    printf("%d", carry);
    return;
  }

  for (i = 0; i < 100; i++)
    sum += grid[i][place] - '0';

  addBig(place - 1, sum/10, grid);
  printf("%d", sum % 10);
}