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 <stdio.h>
#include <iostream>
#include <string>
using namespace std;
int main()
{
	int n;
	int result;
	char alpha[26] = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
	string a;
	scanf("%d\n", &n);
	getline(cin, a);
	for(int i = 0 ; i < a.length()+1 ; i+=2){
		result = 0;
		if(a.length()-1 < i+1) break;
		if(a[i] == ' '){i++;printf(" ");}
		else if(a[i+1] == ' '){printf(" ");continue;}
		for(int j = 0 ; j < 26; j++){
			if(a[i] == alpha[j]) result += j;
			if(a[i+1] == alpha[j]) result += j;
		}
		result -= n;
		while(result < 0){result += 26;}
		printf("%c",result%26 + 97);
	}
}
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