This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
int main() {
	int n;
	char buf[11000];
	cin >> n;
	//getchar();
	//cin.getline(buf, 11000);
	fgets(buf, 11000, stdin);
	int len = strlen(buf);
	for (int i=0;i<len;i+=2) {
		char a=buf[i],b = buf[i+1];
		if(a==' '){
			printf(" ");
			i++;
			a = buf[i];
			b = buf[i+1];
		}
	    //cout << b;	
		if('a'<=b && b<='z') {
			printf("%c", (((a-'a')+(b-'a')-n)%26)+'a');
		}
		else if(b==' '){
			printf(" ");
		}
		
	}
	cout << endl;
	
	return 0;
}
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