diff --git a/1684-count-the-number-of-consistent-strings/1684-count-the-number-of-consistent-strings.c b/1684-count-the-number-of-consistent-strings/1684-count-the-number-of-consistent-strings.c
new file mode 100644
index 0000000..01a6ff5
--- /dev/null
+++ b/1684-count-the-number-of-consistent-strings/1684-count-the-number-of-consistent-strings.c
@@ -0,0 +1,24 @@
+
+
+int countConsistentStrings(char * allowed, char ** words, int wordsSize){
+    
+    bool allowedFilter[26] = {false};
+    for (char *c = allowed; *c != '\0'; ++c) {
+        allowedFilter[*c - 'a'] = true;
+    }
+    
+    int numAllowedWords = 0;
+    for (int i = 0; i < wordsSize; ++i) {
+        bool allowedWord = true;
+        for (char* a = words[i]; *a != '\0'; ++a) {
+            if (!allowedFilter[*a - 'a']) {
+                allowedWord = false;
+                break;
+            }
+        }  
+        if (allowedWord) {
+            ++numAllowedWords;
+        }
+    }
+    return numAllowedWords;
+}
\ No newline at end of file