Strcpy()

//Пейстбин
//strcpy(new_word,old_word);

#include <stdio.h>
#include <math.h>
#define SIZE 20

int main()
{
    char old_word[SIZE],new_word[SIZE];

    gets(old_word);
    gets(new_word);

   /* do
    {
      old_word[0] = new_word[0];
      gets(new_word);
    }while(old_word[0]==new_word[0]);*/



    while(old_word[0]==new_word[0])
    {
        old_word[0] = new_word[0];
        gets(new_word);
    }

    return 0;
}