Buggy python submission (verdict: Runtime Error):
abcd = int(input())
A,B,C,D = abcd[0],abcd[1],abcd[2]abcd[3]
if A + B + C + D == 7:
  print('{}+{}+{}+{}=7'.format(A, B, C, D))
elif A + B + C - D == 7:
  print('{}+{}+{}-{}=7'.format(A, B, C, D))
elif A + B - C + D == 7:
  print('{}+{}-{}+{}=7'.format(A, B, C, D))
elif A + B - C - D == 7:
  print('{}+{}-{}-{}=7'.format(A, B, C, D))
elif A - B + C + D == 7:
  print('{}-{}+{}+{}=7'.format(A, B, C, D))
elif A - B + C - D == 7:
  print('{}-{}+{}-{}=7'.format(A, B, C, D))
elif A - B - C + D == 7:
  print('{}-{}-{}+{}=7'.format(A, B, C, D))
else:
  print('{}-{}-{}-{}=7'.format(A, B, C, D))


Fixed submission:
abcd = input()
A,B,C,D = int(abcd[0]),int(abcd[1]),int(abcd[2]),int(abcd[3])    
if A + B + C + D == 7:
  print('{}+{}+{}+{}=7'.format(A, B, C, D))
elif A + B + C - D == 7:
  print('{}+{}+{}-{}=7'.format(A, B, C, D))
elif A + B - C + D == 7:
  print('{}+{}-{}+{}=7'.format(A, B, C, D))
elif A + B - C - D == 7:
  print('{}+{}-{}-{}=7'.format(A, B, C, D))
elif A - B + C + D == 7:
  print('{}-{}+{}+{}=7'.format(A, B, C, D))
elif A - B + C - D == 7:
  print('{}-{}+{}-{}=7'.format(A, B, C, D))
elif A - B - C + D == 7:
  print('{}-{}-{}+{}=7'.format(A, B, C, D))
else:
  print('{}-{}-{}-{}=7'.format(A, B, C, D))

Buggy python submission (verdict: Runtime Error):
A, B, C, D = map(int, input().split())
if A + B + C + D == 7:
  print('{}+{}+{}+{}=7'.format(A, B, C, D))
elif A + B + C - D == 7:
  print('{}+{}+{}-{}=7'.format(A, B, C, D))
elif A + B - C + D == 7:
  print('{}+{}-{}+{}=7'.format(A, B, C, D))
elif A + B - C - D == 7:
  print('{}+{}-{}-{}=7'.format(A, B, C, D))
elif A - B + C + D == 7:
  print('{}-{}+{}+{}=7'.format(A, B, C, D))
elif A - B + C - D == 7:
  print('{}-{}+{}-{}=7'.format(A, B, C, D))
elif A - B - C + D == 7:
  print('{}-{}-{}+{}=7'.format(A, B, C, D))
else:
  print('{}-{}-{}-{}=7'.format(A, B, C, D))


Fixed submission:
abcd = input()
A,B,C,D = int(abcd[0]),int(abcd[1]),int(abcd[2]),int(abcd[3])    
if A + B + C + D == 7:
  print('{}+{}+{}+{}=7'.format(A, B, C, D))
elif A + B + C - D == 7:
  print('{}+{}+{}-{}=7'.format(A, B, C, D))
elif A + B - C + D == 7:
  print('{}+{}-{}+{}=7'.format(A, B, C, D))
elif A + B - C - D == 7:
  print('{}+{}-{}-{}=7'.format(A, B, C, D))
elif A - B + C + D == 7:
  print('{}-{}+{}+{}=7'.format(A, B, C, D))
elif A - B + C - D == 7:
  print('{}-{}+{}-{}=7'.format(A, B, C, D))
elif A - B - C + D == 7:
  print('{}-{}-{}+{}=7'.format(A, B, C, D))
else:
  print('{}-{}-{}-{}=7'.format(A, B, C, D))

Buggy python submission (verdict: Runtime Error):
A, B, C, D = map(int, raw_input().split())
if A + B + C + D == 7:
  print('{}+{}+{}+{}=7'.format(A, B, C, D))
elif A + B + C - D == 7:
  print('{}+{}+{}-{}=7'.format(A, B, C, D))
elif A + B - C + D == 7:
  print('{}+{}-{}+{}=7'.format(A, B, C, D))
elif A + B - C - D == 7:
  print('{}+{}-{}-{}=7'.format(A, B, C, D))
elif A - B + C + D == 7:
  print('{}-{}+{}+{}=7'.format(A, B, C, D))
elif A - B + C - D == 7:
  print('{}-{}+{}-{}=7'.format(A, B, C, D))
elif A - B - C + D == 7:
  print('{}-{}-{}+{}=7'.format(A, B, C, D))
elif A - B - C - D == 7:
  print('{}-{}-{}-{}=7'.format(A, B, C, D))


Fixed submission:
abcd = input()
A,B,C,D = int(abcd[0]),int(abcd[1]),int(abcd[2]),int(abcd[3])    
if A + B + C + D == 7:
  print('{}+{}+{}+{}=7'.format(A, B, C, D))
elif A + B + C - D == 7:
  print('{}+{}+{}-{}=7'.format(A, B, C, D))
elif A + B - C + D == 7:
  print('{}+{}-{}+{}=7'.format(A, B, C, D))
elif A + B - C - D == 7:
  print('{}+{}-{}-{}=7'.format(A, B, C, D))
elif A - B + C + D == 7:
  print('{}-{}+{}+{}=7'.format(A, B, C, D))
elif A - B + C - D == 7:
  print('{}-{}+{}-{}=7'.format(A, B, C, D))
elif A - B - C + D == 7:
  print('{}-{}-{}+{}=7'.format(A, B, C, D))
else:
  print('{}-{}-{}-{}=7'.format(A, B, C, D))

Buggy python submission (verdict: Runtime Error):
A, B, C, D = map(int, input().split())
if A + B + C + D == 7:
  print('{}+{}+{}+{}=7'.format(A, B, C, D))
elif A + B + C - D == 7:
  print('{}+{}+{}-{}=7'.format(A, B, C, D))
elif A + B - C + D == 7:
  print('{}+{}-{}+{}=7'.format(A, B, C, D))
elif A + B - C - D == 7:
  print('{}+{}-{}-{}=7'.format(A, B, C, D))
elif A - B + C + D == 7:
  print('{}-{}+{}+{}=7'.format(A, B, C, D))
elif A - B + C - D == 7:
  print('{}-{}+{}-{}=7'.format(A, B, C, D))
elif A - B - C + D == 7:
  print('{}-{}-{}+{}=7'.format(A, B, C, D))
elif A - B - C - D == 7:
  print('{}-{}-{}-{}=7'.format(A, B, C, D))


Fixed submission:
abcd = input()
A,B,C,D = int(abcd[0]),int(abcd[1]),int(abcd[2]),int(abcd[3])    
if A + B + C + D == 7:
  print('{}+{}+{}+{}=7'.format(A, B, C, D))
elif A + B + C - D == 7:
  print('{}+{}+{}-{}=7'.format(A, B, C, D))
elif A + B - C + D == 7:
  print('{}+{}-{}+{}=7'.format(A, B, C, D))
elif A + B - C - D == 7:
  print('{}+{}-{}-{}=7'.format(A, B, C, D))
elif A - B + C + D == 7:
  print('{}-{}+{}+{}=7'.format(A, B, C, D))
elif A - B + C - D == 7:
  print('{}-{}+{}-{}=7'.format(A, B, C, D))
elif A - B - C + D == 7:
  print('{}-{}-{}+{}=7'.format(A, B, C, D))
else:
  print('{}-{}-{}-{}=7'.format(A, B, C, D))

Buggy python submission (verdict: Runtime Error):
A, B, C, D = map(int,input().split())
if A + B + C + D == 7;
  print('{}+{}+{}+{}=7'.format(A, B, C, D))
elif A + B + C - D == 7;
  print('{}+{}+{}-{}=7'.format(A, B, C, D))
elif A + B - C + D == 7;
  print('{}+{}-{}+{}=7'.format(A, B, C, D))
elif A + B - C - D == 7;
  print('{}+{}-{}-{}=7'.format(A, B, C, D))
elif A - B + C + D == 7;
  print('{}-{}+{}+{}=7'.format(A, B, C, D))
elif A - B + C - D == 7;
  print('{}-{}+{}-{}=7'.format(A, B, C, D))
elif A - B - C + D == 7;
  print('{}-{}-{}+{}=7'.format(A, B, C, D))
elif A - B - C - D == 7;
  print('{}-{}-{}-{}=7'.format(A, B, C, D))

Fixed submission:
abcd = input()
A,B,C,D = int(abcd[0]),int(abcd[1]),int(abcd[2]),int(abcd[3])    
if A + B + C + D == 7:
  print('{}+{}+{}+{}=7'.format(A, B, C, D))
elif A + B + C - D == 7:
  print('{}+{}+{}-{}=7'.format(A, B, C, D))
elif A + B - C + D == 7:
  print('{}+{}-{}+{}=7'.format(A, B, C, D))
elif A + B - C - D == 7:
  print('{}+{}-{}-{}=7'.format(A, B, C, D))
elif A - B + C + D == 7:
  print('{}-{}+{}+{}=7'.format(A, B, C, D))
elif A - B + C - D == 7:
  print('{}-{}+{}-{}=7'.format(A, B, C, D))
elif A - B - C + D == 7:
  print('{}-{}-{}+{}=7'.format(A, B, C, D))
else:
  print('{}-{}-{}-{}=7'.format(A, B, C, D))