fix mismatch

app.py

@@ -7,6 +7,9 @@ def get_mismatched_sentences(reference, hypothesis):
     """
     Get mismatched sentences between reference and hypothesis.
     """
+    reference = reference.split()
+    hypothesis = hypothesis.split()
+    
     mismatched = []
     for ref, hyp in zip(reference, hypothesis):
         if ref != hyp: