//substitution cipher
//written by Sadi Evren SEKER

#include <stdio.h>

main(){
	int lookup[26]={3,2,1,5,6,4,9,8,7,19,18,17,16,15,14,13,12,11,10,26,25,24,23,22,21,20};
	int lookup2[26]={3,2,1,6,4,5,9,8,7,19,18,17,16,15,14,13,12,11,10,26,25,24,23,22,21,20};
	int i;
	char *plain,*encrypt;
	printf("Please enter plain text\n");
	scanf("%s",plain);
	printf("deneme");
	for(i=0;plain[i]!='\0';i++){
//		printf(" %c ",lookup[2]+97);
		encrypt[i]=lookup[plain[i]-97]+97;
	}
	
	encrypt[i]='\0';
	printf("%s",encrypt);
	
	for(i=0;plain[i]!='\0';i++){
//		printf(" %c ",lookup2[2]+97);
		plain[i]=lookup2[encrypt[i]-97]+97;
	}
}