diff --git a/src/pyotp/contrib/steam.py b/src/pyotp/contrib/steam.py
index 1cd2bdd..35c6cc6 100644
--- a/src/pyotp/contrib/steam.py
+++ b/src/pyotp/contrib/steam.py
@@ -29,16 +29,12 @@ def generate_otp(self, input: int) -> str:
         :param input: the HMAC counter value to use as the OTP input.
             Usually either the counter, or the computed integer based on the Unix timestamp
         """
-        str_code = super().generate_otp(input)
-        int_code = int(str_code)
-
-        steam_code = ""
+        int_code = int(super().generate_otp(input))
         total_chars = len(STEAM_CHARS)
 
+        digits = []
         for _ in range(STEAM_DEFAULT_DIGITS):
-            pos = int_code % total_chars
-            char = STEAM_CHARS[int(pos)]
-            steam_code += char
+            digits.append(STEAM_CHARS[int_code % total_chars])
             int_code //= total_chars
 
-        return steam_code
+        return "".join(digits)