#include<stdio.h>
#include<stdlib.h>
struct zimu
{
	char c;
	struct zimu *next;
};
int main(void)
{
	int i,n,j;
	scanf("%d", &n);
	getchar();
	char c0 = 'a';
	struct zimu *p1;
	struct zimu *p2;
	struct zimu *head;
	p1 = (struct zimu *)malloc(sizeof(struct zimu));
	head = p1;
	for (i = 1;i <= 26;i++)
	{
		p1->c = c0;
		c0++;
		if (i == 26)
		{
			p1->next = head;
			break;
		}
		p2 = p1;
		p1 = (struct zimu*)malloc(sizeof(struct zimu));
		p2->next = p1;
	}
	char a[50];
	for (i = 0;i <= 49;i++)a[i] = '\0';
	c0 = getchar();
	for (i = 0;c0 != '\n';i++)
	{
		a[i] = c0;
		c0 = getchar();
	}
	struct zimu *p;
	for (i = 0;a[i] != '\0';i++)
	{
		for (p = head;p->c != a[i];p = p->next);
		for (j = 1;j <= n;j++)p = p->next;
		a[i] = p->c;
    }
	for (i = 0;a[i] != '\0';i++)printf("%c", a[i]);
	return 0;
}

这个为什么全部WA？