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#pragma clang system_header
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namespace std {
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class istream {
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public:
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bool is_eof();
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char get_char();
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};
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istream &operator>>(istream &is, char &c) {
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if (is.is_eof())
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return;
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c = is.get_char();
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}
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extern istream cin;
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};
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