diff --git a/E_1876_SubstringsofSizeThreewithDistinctCharacters.py b/E_1876_SubstringsofSizeThreewithDistinctCharacters.py
new file mode 100644
index 0000000..de5ace4
--- /dev/null
+++ b/E_1876_SubstringsofSizeThreewithDistinctCharacters.py
@@ -0,0 +1,8 @@
+class Solution:
+    def countGoodSubstrings(self, s: str) -> int:
+        counter=0
+        for i in range(len(s)-2):
+            if len(s[i:i+3]) == len(set(s[i:i+3])):
+                counter = counter+1
+                
+        return counter
\ No newline at end of file