It depends on the font. Using this font, I count 8 upper case letters:
E F H I M N W Z
and 2 Lower case letters:
w z
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25 o because sOme of them are perpendicular
I
In the case of upper case letters in the Roman alphabet, and allowing tine segments of lines that are curved, they are: B, C, D, E, F, G, H, M, N, O, P, Q, R, S, U, Z.
None in the Roman alphabet.
The latin alphabet for English has 52 letters, if you count both upper case and lower case. Otherwise, there no other alphabet with 52 letters.