#include <stdio.h>
 
int main(void) {
	char ch = 'z';
	int key = 10;
	if (ch >= 'a' && ch <= 'z'){
		ch = ch + key;
	    if (ch > 'z') {
	    	ch = ch - 'z' + 'a' - 1;
	    }  
	}
	return 0;
}
 
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