in C++ please:

#include using namespace std;

int main() { /* Type your code here. */ string str; int i; for (i=0; i

this is what i have so far but its coming up as an error

4.20 LAB: Remove all non alpha characters Write a program that removes all non alpha characters from the given input. Ex: If the input is: -Hello, 1 worlds! the output is: Helloworld 451754.3251632.qx3zqy7 \begin{tabular}{l|l} LAB & 4.20.1: LAB: Remove all non alpha characters \end{tabular} 0/10 main.cpp Load default template... 1 \#include 2 using namespace std; int main(){ /* Type your code here. */