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#
# Usage:
# prcontext <pattern> <# lines of context>
#
import sys
#
# Get the arguments
#
pattern=sys.argv[1]
num=int(sys.argv[2])
#
# Get all of the lines in the file.
#
lines=sys.stdin.readlines()
index=0
for line in lines:
if ((line.find(pattern)) != -1):
if (index-num < 0):
bottom=0
else:
bottom=index-num
for output in lines[bottom:index+num+1]:
print output[:-1]
index=index+1
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