Problem Statement

Print the $L$-th through $R$-th characters of the string atcoder.

Constraints

• $L$ and $R$ are integers.
• $1 \\le L \\le R \\le 7$

Input

Input is given from Standard Input in the following format:

$L$ $R$

Output

Print the answer.

Sample Input 1

3 6

Sample Output 1

code

The $3$-rd through $6$-th characters of atcoder are code.

Sample Input 2

4 4

Sample Output 2

o

Sample Input 3

1 7

Sample Output 3

atcoder