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OI-codes/Luogu/CF1146A/CF1146A.cpp

17 lines
243 B
C++

#include <bits/stdc++.h>
using namespace std;
int main() {
char c;
int n = 0, a = 0;
while (cin >> c) {
n++;
if (c == 'a') {
a++;
}
}
cout << min(a * 2 - 1, n) << endl;
return 0;
}