How to mark a point in a MATLAB plot?

 I have this plot 

I need to make a straight vertical line at a point on x axis that the user enters and show the coordinates of the intersection of that vertical line with my plot.

How can this be done in MATLAB?

for example: the user enters 1020 then a straight vertical line will be drawn at 1020 that meets the plot at some point and the coordinates of that point will be shown somehow.  

NOTE:-

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Answers: 
One way to do this is to use the GINPUT function to graphically select a point using the mouse. Assuming the data you plotted is stored in a variable data, the following code should do the sort of thing you want. 
 
set(gca,'XLimMode','manual','YLimMode','manual');  % Fix axes limits
hold on;
[x,y] = ginput(1);  % Select a point with the mouse
x = round(x);       % Round x to nearest integer value 
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https://matlabhelpers.com/questions/how-to-mark-a-point-in-a-matlab-plot-.php

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