Use io.read() Beware that the function can be customised with different parameters. Here are some examples.
s = io.read("*n") -- read a number
s = io.read("*l") -- read a line (default when no parameter is given)
s = io.read("*a") -- read the complete stdin
s = io.read(7) -- read 7 characters from stdin
x,y = io.read(7,12) -- read 7 and 12 characters from stdin and assign them to x and y
a,b = io.read("*n","*n") -- read two numbers and assign them to a and b
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