#include <stdio.h>
#include <ctype.h>
 
int main(int argc, char *argv[]) {

    int position = 1;
    char character;

    while(character = getchar()) {

        // (character >= 'a' && character <= 'z') || (character >= 'A' && character <= 'Z');
        // if you prefer
        if (isalpha(character)) {

            // checking if the end result would be a letter
            while (!isalpha(character + position)) {
                character -= 26;
            }

            // print end result
            printf("%c", (character + position));

        }
        else if (character == '\n') {

            printf("\n");
            return 0;
        } else {
            // print result if non alpha
            printf("%c", character);
        }
        position++;

    }   

}