import re
print(re.sub(r"\b([^\W\d_])([^\W\d_]*)([^\W\d_])\b", (lambda m: "{0}{1}{2}".format(m.group(1), len(m.group(2)), m.group(3))), "Testers"))
aW1wb3J0IHJlCnByaW50KHJlLnN1YihyIlxiKFteXFdcZF9dKShbXlxXXGRfXSopKFteXFdcZF9dKVxiIiwgKGxhbWJkYSBtOiAiezB9ezF9ezJ9Ii5mb3JtYXQobS5ncm91cCgxKSwgbGVuKG0uZ3JvdXAoMikpLCBtLmdyb3VwKDMpKSksICJUZXN0ZXJzIikp