diff --git a/ex14.c b/ex14.c
index 23292e1..403769b 100644
--- a/ex14.c
+++ b/ex14.c
@@ -20,7 +20,7 @@ void print_letters(char arg[], int nchars)
     for (i = 0; i < nchars; i++) {
         char ch = arg[i];
 
-        if(isalnum(ch) || isblank(ch)) {
+        if(isalpha(ch) || isblank(ch)) {
             printf("'%c' == %d ", ch, ch);
         }
     }