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 <string>
#include <cstring>
#include <iostream>
#include <cstdio>
using namespace std;
int n;
char en(char a,char b)
{
        int t = (int)(a + b - 'a'-'a') -  n + 26;
        t %= 26;
        
        return (char)t + 'a';
}
int main()
{
        scanf("%d",&n);
        char str[10000];
  getchar();
        gets(str);
        for(int i = 0;i < strlen(str); i++)
        {
                if(str[i] == ' ')
                {
                        printf(" ");
                        i++;
                }
                if(i + 1 >= strlen(str))
                {
                        break;
                }
                if(str[i+1] == ' '){
                        continue;
                }
                printf("%c",en(str[i],str[i + 1]));
                i++;
        }
        printf("\n");
        
        return 0;
}
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