#include <stdio.h>

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

    while ((c = getchar()) != EOF) {
        // Check if the character is a lowercase letter
        if (c >= 'a' && c <= 'z') {
            // Convert lowercase to uppercase
            c = c - 'a' + 'A';
        }
        // Check if the character is an uppercase letter
        else if (c >= 'A' && c <= 'Z') {
            // Convert uppercase to lowercase
            c = c - 'A' + 'a';
        }
        // Check if the character is an end of line
        else if (c == '\n') {
            // Increment line count
            lines_count++;
        }

        // Output the character
        putchar(c);
    }

    // Print the number of lines read
    printf("Lines count: %d\n", lines_count);

    return 0;
}