#include <iostream> #include<stack> using namespace std; int main() { string str, res; stack<string> stk; getline(cin, str); for(int i=0;i<str.size();i++){ if(str[i]>='a'&&str[i]<='z'||str[i]>='A'&&str[i]<='Z'||str[i]==' '){co...
