#include<stdio.h>
#include<ctype.h>
#include<stdlib.h>
int main(void)
{
    char litera;
    printf("prosze podac znak\n");
    litera=getchar();
    if(isalpha(litera)) printf("podano litere\n");
        else if(isdigit(litera)) printf("podano liczbe\n");
        
    if(isalpha(litera)){
       litera=tolower(litera);
       putchar(litera);
       putchar(' ');
       putchar(toupper(litera));
       printf("\n");
    }
    system("pause");
    return 0;
}