[Python] I am trying to make a degree calculator from farenheit to celsius

I keep getting this error:

"TypeError: can only concatenate str (not "int") to str"
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import math
temp_input = input(
'Insert the temperature you would like to convert(100F , 35C for example):')
unit = temp_input[-1].lower()
number = temp_input[:-1]

F_temp = ((( 9 *(number)) + 160) // 5)
C_temp = (((5 * (number)) - 160) // 9)

if temp_input[-1:] == 'f':
print(C_temp)
elif temp_input[-1:] == 'c':
print(F_temp)
else:
print('try to add C / F , after the numbers !')

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