Removing elements from vector using remove_if

I am trying to remove vector elements using remove_if. But unsuccessfully. What am I doing wrong?

Here's my code:

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

void printme(std::vector<int>& a){
    for(const auto& item: a)
    std::cout << item << std::endl;
}

int main()
{
    std::vector<int> a {1, 2, 3, 4, 5, 6};
    printme(a);  
    a.erase( (std::remove_if(a.begin(), a.end(), [](const int& x){
        return x == 2;
        }), a.end()));
    printme(a);
}

My output is just:

1 2 3 4 5 6

Expected output:

1 2 3 4 5 6 1 3 4 5 6