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| #include <bits/stdc++.h> | |
| using namespace std; | |
| int main() { | |
| ios::sync_with_stdio(false), cin.tie(nullptr); | |
| long long a, b; | |
| cin >> a >> b; | |
| if (a > b) swap(a, b); | |
| if (a == b || b - a == 1) | |
| cout << 0; | |
| else { | |
| cout << b - a - 1 << '\n'; | |
| for (long long i = a + 1; i < b; i++) cout << i << ' '; | |
| } | |
| } |
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