Strings

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    int main() {
    	
        string a, b;
        getline(cin, a);
        getline(cin, b);
        
        std::cout << a.size() << " " << b.size() << std::endl;
        std::cout << a + b << std::endl;
        std::cout << b[0] + a.substr(1, a.npos) << " " << a[0] + b.substr(1, b.npos);
        return 0;
    }