i wrote this on my phone at the airport

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Problem

On a small southwest airline plane, the boarding works as follows:

1. A1-15
2. A15-30
3. B1-15
4. B16-30
5. C1-15
6. C16-30
7. C31+ (max 99)

Given your position, give the numeric boarding number

Options

exec is denied

rejudge feature is enabled

now post-mortem time, all source codes will be revealed

Sample input:_

C31
A19
A20
C23
C90
B8
B3
A15
A7
C23
A29
C76
A21
B5
B28
B1
B24
C1
C89
B25
C1
C5
B10
B8
C94
C11
A4
C85
A12
C7
C17
C7
C9
C23
C91
A21
A30
C3
A15
A28
C70
B17
C21
C38
B14
C7
B23
C24
C27
B2
C30
C29
A10
C24
B22
B7
B9
C5
C6
B18
C6
A23
A13
B8
A24
C10
C22
A1
B14
B17
C2
C75
C10
C88
C88
C23
A29
C9
C13
C23
B13
C8
C70
A14
B4
B12
A12
A24
C23
B28
C10
C24
C31
C17
C6
A15
A22
A10
B1
B2

Sample output:

7
2
2
6
7
3
3
1
1
6
2
7
2
3
4
3
4
5
7
4
5
5
3
3
7
5
1
7
1
5
6
5
5
6
7
2
2
5
1
2
7
4
6
7
3
5
4
6
6
3
6
6
1
6
4
3
3
5
5
4
5
2
1
3
2
5
6
1
3
4
5
7
5
7
7
6
2
5
5
6
3
5
7
1
3
3
1
2
6
4
5
6
7
6
5
1
2
1
3
3

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