Problem Statement

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

Input

Input is given from Standard Input in the following format:
L R

Output

Print the answer.

Constraints

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

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

见题面 Input 部分

见题面 Output 部分