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#include <bits/stdc++.h>
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using namespace std;
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//利用分解质因数模板,扩展出是不是漂亮数
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bool isPLS(int x) {
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for (int i = 2; i * i <= x; i++) {
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int s = 0;
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while (x % i == 0) x /= i, s++;
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//只有1个因子,就不是漂亮数
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if (s == 1) return false;
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}
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//如果存在一个大的质数因子,也不是漂亮树
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if (x > 1) return false;
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return true;
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}
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int m, n, cnt;
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int main() {
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cin >> m >> n;
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for (int i = m; i < n; i++)
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if (isPLS(i) && isPLS(i + 1)) {
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printf("%d %d\n", i, i + 1);
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cnt++;
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}
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if (!cnt) printf("no find");
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return 0;
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}
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