diff --git a/15/a/final.py b/15/a/final.py
new file mode 100644
index 0000000..8eb6c3e
--- /dev/null
+++ b/15/a/final.py
@@ -0,0 +1,24 @@
+def getBASIC():
+   res = []
+   x=""
+   while not "END" in x.split():
+      x = input()
+      res.append(x)
+   return res
+
+def findLine(prog, target):
+   for i in prog:
+      if i.split()[0] == target:
+         return prog.index(i)
+
+def execute(prog):
+   lines = set()
+   location = 0
+   while True:
+      lines.add(location)
+      if location==len(prog)-1: return "success"
+      location = findLine(prog, prog[location].split()[-1])
+      if location in lines: return "infinite loop"
+
+if __name__ == "__main__":
+   print(execute(getBASIC()))