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

int main (){
	char c[100];
	char musor;
	int counter = 0;
	while(fgets(c, 100, stdin) != NULL){
		if(strlen(c) == 1){
			putchar (c[0]);
			counter++;
		}
		else if(strlen(c) == 2){
			if (c[0] >= 'a' && c[0] <= 'z'){
				putchar (c[0] - 'a' + 'A');
				printf ("\n");
				counter++;
			}
			else if ( c[0] >= 'A' && c[0] <= 'Z'){
				putchar (c[0] + 'a' - 'A');
				printf ("\n");
				counter++;
			}
			else if (!isalpha (c[0])) {
				putchar (c[0]);
				counter++;
			}
		}
		else{
			for(int i = 0; i < 100; i++){
				if(c[i] == '\n' || c[i] == '\0') break;
				if(isupper(c[i])) {
                    printf("%c", tolower(c[i]));
                }
				else if(islower(c[i]))
					printf("%c", toupper(c[i]));
				else
					printf("%c", c[i]);
			}
			if(strchr(c, '\n') != NULL){
			    printf("\n");
                counter++;
			}
		}
		memset(c, '\0', 100);
	}

	printf("\nPočet riadkov: %d\n",counter);

	return 0;
}