The Decoder.cpp

#include<stdio.h>

int main() 

{

    char cha;

    while(scanf("%c", &cha) != EOF)

    {

        if(cha!='\n')

        {

            printf("%c", (cha-7));

        }    

	else 

        {

            printf("\n");

        }    

    }

    return 0;

}