#include <stdio.h> #include <math.h> #define MAXLEN 1024 #define ASVALUE 'a' - 'A' _Bool compare(char a, char b){ if((a >='A' && a <= 'z') && (b >='A' && b <= 'z')){ if(abs(a - b) == ASVALUE) return 1; } if(a - b == 0)retur...