Question: A plaintext is encrypted by using trigraph transformation and ElGamal encryption algorithm The Rublic keys p , a , and and the Rrivate kex a

A plaintext is encrypted by using trigraph transformation and ElGamal encryption algorithm The Rublic keys p, a, and and the Rrivate kex a are given as follows: p=24391,a=37,=4336,a=2215. The following ciphertext is obtained. Find the original plaintext.
(21873,16560)(14799,812)(5055,11343)(23596,23010)(23358,6767)(6604,20637)
(3304,165)(18805,13373)(19986,20619)(14372,8681)(13735,3921)(1893,23356)
(3104,6956)(10875,6779)(10449,1656)(15510,907)(17392,2869)
A plaintext is encrypted by using trigraph transformation and ElGamal encryption

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