2020-10-23 20:29:53 +08:00
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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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char c;
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2021-11-19 17:01:13 +08:00
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int n = 0, a = 0;
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2020-10-23 20:29:53 +08:00
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while (cin >> c) {
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n++;
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if (c == 'a') {
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a++;
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}
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}
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cout << min(a * 2 - 1, n) << endl;
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return 0;
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}
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