3.1(Complete)

//https://vk.com/evgenykravchenko0

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            /  /:/ /:/_               \  \:\           /  /:/_/::\           /  /:/ /:/_
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            \  \::/ /:/          \  \:\|  |:|          \  \:\  /:/           \  \::/ /:/
             \  \:\/:/            \  \:\__|:|           \  \:\/:/             \  \:\/:/
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                       /__/::::::::\         \__\/\:\__          \__\/\:\__
                       \  \:\~~\~~\/            \  \:\/\            \  \:\/\
                        \  \:\  ~~~              \__\::/             \__\::/
                         \  \:\                  /__/:/              /__/:/
                          \  \:\                 \__\/               \__\/
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#include <stdio.h>

int position_words (char firstword[], char secondword[])
{
  int i;
  int l = 5;
  int count = 0;

  for (i = 0; i < l; i++)
    if (firstword[i] != secondword[i] && firstword[i] >= 'A' && firstword[i] <= 'z' && secondword[i] >= 'A' && secondword[i] <= 'z')
      count++;
  return count;
}

int main()
{
  char* sentence[] = {"hello", "world"};
  int l = 2;
  int maxpos = 0;
  int curent;
  int next;

  for (curent = 0; curent < l; curent++)
    for (next = 0; next < l; next++)
      if (position_words(sentence[curent], sentence[next]) > maxpos)
        maxpos = position_words(sentence[curent], sentence[next]);

  printf("Отлично позиций : %d ", maxpos);

  return 0;
}