#include <stdio.h>
#include <ctype.h>

int main()
{
    int pocetRiadkov = 0;
    while (vstup)
    {
        int vstup = getchar();
        if (vstup == EOL) {break;}
        
        if (vstup == '\n')
        {
            pocetRiadkov += 1;
            putchar(vstup);
        }

        else if (islower(vstup) != 0) 
        {
            putchar(toupper(vstup));
        }

        else if (isupper(vstup) != 0)
        {
            putchar(tolower(vstup));
        }

        else if (iscntrl(vstup) != 0)
        {
            putchar(vstup);
        }

    }
    printf("\nLines_count: %d\n", pocetRiadkov);
    return 0;
}