#include <iostream> using namespace std; #include <string> int main() { string s1,s2,s3; cin>>s1>>s2;//输入两个字符串 for(int i=0;i<s1.size();i++) { s3+=s1[i]; } for(int i=0;i<s2.size();i++) { s3+=s2[i]; } cout<<s3<...