diff --git a/latex_legacy_converter.py b/latex_legacy_converter.py
index d1c6e14..8a57dfd 100644
--- a/latex_legacy_converter.py
+++ b/latex_legacy_converter.py
@@ -1,13 +1,14 @@
 from constants import ENVIRONMENTS, ALPHABETS, DEPRECATED
 import re
-import pathlib
 from pathlib import Path
 
 
 def _migrate_lazy_math_alphabet(line: str, letters: str, short: str, alph: str):
     for letter in letters:
         while True:
-            m = re.search(r'\\%s%s(?=![a-zA-Z@])' % (short, letter), line)
+            if r'\fS' in line:
+                pass
+            m = re.search(r'\\%s%s(?![a-zA-Z@])' % (short, letter), line)
             if m is None:
                 break
             else:
@@ -16,7 +17,7 @@ def _migrate_lazy_math_alphabet(line: str, letters: str, short: str, alph: str):
 
 
 def migrate_lazy_math_alphabets(line: str) -> str:
-    for short, alph in ALPHABETS:
+    for short, alph in ALPHABETS.items():
         if short == '':
             line = _migrate_lazy_math_alphabet(line, 'NZQRCFK', '', alph)
         else:
@@ -30,7 +31,7 @@ def migrate_deprecated(line: str) -> str:
     for old, new in DEPRECATED.items():
         while True:
             old = old.replace('\\', r'\\')
-            m = re.search(old + '(?=![a-zA-Z@])', line)
+            m = re.search(old + '(?![a-zA-Z@])', line)
             if m is None:
                 break
             else:
@@ -64,6 +65,7 @@ def convert(path: Path):
 
 
 if __name__ == "__main__":
-    here = Path('.')
-    for file in here.rglob('*.tex'):
+    here = Path('.').resolve()
+    files = here.rglob('*.tex')
+    for file in files:
         convert(Path(file))