Please help me find the error. Line 16 syntax error "elif" but I don't understand

Question

https://code.sololearn.com/cxL0LScTeB8G/?ref=app

Answer 1

All your print statements must be indented too.

if what=="+":
c= a+b

print("Результат"+ str(с))

elif what=="-":
c=a-b
print("Результат"+ str(с))

else:
print("Выбрана неверная операция!")