diff --git a/709-to_lower_case/python/709.py b/709-to_lower_case/python/709.py
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+++ b/709-to_lower_case/python/709.py
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+# 709. To Lower Case
+#
+# Given a string s, return the string after replacing every uppercase letter
+# with the same lowercase letter.
+#
+# s consists of printable ASCII characters
+
+# apenas processar letras 'A-Z'
+# codigo ASCII de 'A' = 65 e 'Z' = 90
+
+
+def toLowerCase(s: str) -> str:
+    resultado: str = ""
+    for index in range(len(s)):
+        if ord(s[index]) >= 65 and ord(s[index]) <= 90:
+            resultado += chr(ord(s[index]) + 32)
+        else:
+            resultado += s[index]
+    return resultado