/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
	}
}

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int main(void)
{
        char message[20];
        int mode;
        int key;
        int i;

        printf("モード選択（暗号化=1, 復号=2）\n");
        printf("--> ");
        scanf("%d", &mode);

        printf("鍵を入力\n");
        printf("--> ");
        scanf("%d", &key);

        switch(mode) {
                case 1:
                        printf("平文を入力\n");
                        printf("--> ");
                        scanf("%s", message);

                        i = 0;
                        printf("暗号文は ");
                        while(message[i] != '\0') {
                                printf("%c", message[i] + (char)key);
                                i++;
                        }
                        printf(" です。\n");
                        break;
                case 2:
                        printf("暗号文を入力\n");
                        printf("--> ");
                        scanf("%s", message);

                        i = 0;
                        printf("平文は ");
                        while(message[i] != '\0') {
                                printf("%c", message[i] - (char)key);
                                i++;
                        }
                        printf(" です。\n");
                        break;
                default:
                        printf("無効なモードです。");
                        break;
        }
        return 0;
}