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Given the following method: public static int f ( String input ) { Stack stack = new Stack ( ) ; int n = 0

Given the following method:
public static int f(String input){
Stack stack = new Stack();
int n =0;
for (int i =0; i < input.length(); i++){
if (input.charAt(i)=='d')
stack.push('d');
else if (input.charAt(i)=='b'){
if (!stack.empty() && stack.pop()=='d') n++;
}
}
return n;
}

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