#include <iostream>
#include <vector>
#include <sstream>
#include <algorithm>
#include <iterator>
#include <stdexcept>
 
int main(){
	std::vector<int> data;
 
    std::string source = "3 a 43 2042 12";
    std::istringstream input(source);
 
    std::string token;
    while(input >> token){
    	try {
    		int num = std::stoi(token);
    		data.push_back(num);
    	}
    	catch(const std::invalid_argument &ex) {}
    }
    for(auto const &el: data){
        std::cout << el << " ";
    }
}

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