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

void main(){
	char a[81];
	int i;
	gets(a);
	
	for(i=0;i<strlen(a);i++){
		if(a[i]>='A'&&a[i]<='Z'){
			a[i]=a[i]+32;
		}else if(a[i]>='a'&&a[i]<='z'){
			a[i]=a[i]-32;
		}
	}
	printf("%s",a);
}


/**************************************************************
	Problem: 1182
	User: admin
	Language: C
	Result: Accepted
	Time:11 ms
	Memory:1036 kb
****************************************************************/