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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int l,re;
- size_t ant;
- string q;
- cin>>q;
- l=q.length();
- ant=count(q.begin(),q.end(),'a');
- if(ant>(l-ant))cout<<l<<endl;
- else{
- re=ant+ant-1;
- cout<<re<<endl;
- }
- return 0;
- }
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