diff --git a/lab43.py b/lab43.py
new file mode 100644
index 0000000..60e7ad0
--- /dev/null
+++ b/lab43.py
@@ -0,0 +1,31 @@
+from os import strerror
+
+file_name = "lab43.txt"
+
+# Il dizionario conterra' una coppia chiave/valore per ogni lettera trovata:
+# chiave = lettera, valore = quante volte appare nel file.
+letters = {}
+
+try:
+    stream = open(file_name, "rt", encoding="utf-8")
+
+    ch = stream.read(1)
+    while ch != "":
+
+        ch = ch.lower()
+
+        if "a" <= ch <= "z":
+            if ch in letters:
+                letters[ch] += 1
+            else:
+                letters[ch] = 1
+
+        ch = stream.read(1)
+
+    stream.close()
+
+    for letter in sorted(letters.keys()):
+        print(letter, "->", letters[letter])
+
+except IOError as e:
+    print("Errore di I/O:", strerror(e.errno))
diff --git a/lab43.txt b/lab43.txt
new file mode 100644
index 0000000..d4a6b50
--- /dev/null
+++ b/lab43.txt
@@ -0,0 +1 @@
+aBc
\ No newline at end of file