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def func_start_A(l): # function to count lines starting with ‘A’
c = 0 # c is the count of such lines
for line in l:
if line.startswith('A'):
c += 1
return c
f1 = open('LINES.txt', 'r')
l = f1.readlines() # creates a list of all the lines in the file
print('Number of lines starting with A in the file LINES.txt is', func_start_A(l))
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