PY
py
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#Enter 7 for your given output
n, i = int(input()), 0
diff=n-1
for a in range(2*n - 1):
if a<n:
i+=a
else:
i-=diff
diff-=1
print('-'*i) if a in range(n-2, n+1) else print('.'*i)
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OUTPUT
Run