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alculquicondor/CF_242A.py

Created November 11, 2012 17:41
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Codeforces 242A
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CF_242A.py
x, y, a, b = [int(x) for x in raw_input().split()]
A = []
for i in range(a if a>b else b+1, x+1):
for j in range(b, min(i, y+1)):
A.append((i, j))
print len(A)
for x in A:
print x[0], x[1]
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