P = 0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141
S1 = 0x44e1ff2dfd8102cf7a47c21d5c9fd5701610d04953c6836596b4fe9dd2f53e3e
S2 = 0x9a5f1c75e461d7ceb1cf3cab9013eb2dc85b6d0da8c3c6e27e3a5a5b3faa5bab
print hex(pow(S1 - S2, P-2, P))
UCA9IDB4ZmZmZmZmZmZmZmZmZmZmZmZmZmZmZmZmZmZmZmZmZmViYWFlZGNlNmFmNDhhMDNiYmZkMjVlOGNkMDM2NDE0MQpTMSA9IDB4NDRlMWZmMmRmZDgxMDJjZjdhNDdjMjFkNWM5ZmQ1NzAxNjEwZDA0OTUzYzY4MzY1OTZiNGZlOWRkMmY1M2UzZQpTMiA9IDB4OWE1ZjFjNzVlNDYxZDdjZWIxY2YzY2FiOTAxM2ViMmRjODViNmQwZGE4YzNjNmUyN2UzYTVhNWIzZmFhNWJhYgoKcHJpbnQgaGV4KHBvdyhTMSAtIFMyLCBQLTIsIFApKQo=