#include <bits/stdc++.h>
using namespace std;
int main(){
int a1=0,sum=1;
string str;
cin>>str;
vector<int> v;
if (str[1]=='a'){v.push_back(1);}
if (str[1]=='i'){v.push_back(0);}
for (int i=2; i<str.size(); i++){
char a=str[i];
if (a=='a'){sum++;v.push_back(1);if (v[a1]==v[a1-1]){sum--;}}
if (a=='i'){sum++;v.push_back(0);if (v[a1]==v[a1-1]){sum--;}}
if (a=='('){a1++;}
if (a==')'){a1--;v.pop_back();}
}
cout<<sum;
}
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