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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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int n, i;
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string str;
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map<string, int> m;
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cin >> n;
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for (i = 1; i <= n; ++i) {
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cin >> str;
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if (m.count(str) > 0) {
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m[str]++;
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cout << str << m[str] << endl;
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} else {
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m[str] = 1;
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cout << "OK" << endl;
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}
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}
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return 0;
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}
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