#include <iostream>
#include <string>
#include <vector>
#include <sstream>
#include <algorithm>
#include <cctype>
 
int convertString(std::string& s) {
    s.erase(std::remove_if(s.begin(),s.end(),isalpha),s.end());
    s.erase(std::remove_if(s.begin(),s.end(),ispunct),s.end());
    std::stringstream ss(s);
    int a;
    ss >> a;
    return a;
}
 
int main() {
    std::string a = "123s45dfas6";
    int b = convertString(a);
    std::cout << a;
}
 

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