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

int main() {
    int c;
    int lines = 0;

    while ((c = getchar()) != EOF) {
        if (islower(c)) {
            putchar(toupper(c));
        } else if (isupper(c)) {
            putchar(tolower(c));
        } else if (c == '\n') {
            putchar(c);
            lines++;
        } else if (c == '\t' || isprint(c)) {
            putchar(c);
        }
    }

    printf("\nLines count: %d\n", lines);
    return 0;
}