P1234 {{Xiao A's Catchphrase}}

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{{Xiao A recently picked up a catchphrase "hehe", so he gives a rectangle and asks you to count how many "$\verb!hehe!$" there are inside (as straight lines in the upward, downward, leftward, or rightward directions).}}

{{The first line contains two numbers $n, m$, representing the size of the rectangle. Then follow $n$ lines, each with $m$ characters, representing the rectangle.}}

{{Output a single number on one line, representing how many "$\verb!hehe!$" there are.}}

{{$1 \leq n, m \leq 1000$.}} Translated by ChatGPT 5