PROGRAMMING:Binary search
Binary search.
###Input example:
Enter a number N in the first line, N in the second line, and the value to be checked in the third line.
```in
twelve
11 14 23 25 68 78 84 97 155 201 310 479
ninety-seven
```
###Output example:
Output the position of the key in the sequence.
```out
seven
```
answer：If there is no answer, please comment
###Input example:
Enter a number N in the first line, N in the second line, and the value to be checked in the third line.
```in
twelve
11 14 23 25 68 78 84 97 155 201 310 479
ninety-seven
```
###Output example:
Output the position of the key in the sequence.
```out
seven
```
answer：If there is no answer, please comment