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Problem2211--ABC150B - Count ABC

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Time Limit : 1.000 sec Memory Limit : 128 MB

We have a string

S

of length

N

consisting of uppercase English letters.
How many times does ABC occur in

S

as contiguous subsequences (see Sample Inputs and Outputs)?

Input is given from Standard Input in the following format:

 $N$  $S$

Print number of occurrences of ABC in

S

as contiguous subsequences.

10
ZABCDBABCQ

Two contiguous subsequences of

S

are equal to ABC: the

2

-nd through

4

-th characters, and the

7

-th through

9

-th characters.

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