Consider the program:

try:

infile $=$ open$("$input$.$txt$","$r$")$

line $=$ infile.readline$()$

value $=$ int$($line$)$

print$($value$)$

except IOError:

print$("$Error opening file."$)$

Suppose the file with the given file name exists and has no contents. Trace the flow of execution. You may refer to the lines by giving each a number, starting at $1.$