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#include <cstdio>
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#include <cstring>
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#include <iostream>
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#include <algorithm>
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using namespace std;
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const int N = 10010;
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int main() {
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int l, r;
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cin >> l >> r;
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int res = 0;
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for (int i = l; i <= r; i++)
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for (int j = i; j; j /= 10)
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if (j % 10 == 2)
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res++;
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cout << res << endl;
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return 0;
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} |
