# this match requires the characters to match exactly

search_str = input('grep: ')
filename   = input('in  : ')

textfile   = open(filename, 'r')
line_num = 0

for line in textfile:
    line_str  = line.strip()
    line_num += 1

    if line_str.find(search_str) >= 0:
        print(line_num, line_str)

textfile.close()