I defined with SAGE:

p=(10^34+1000).next_prime()
E=EllipticCurve(GF(p),[0,57])

My problem is:

I know the x coordinate of a P of the Elliptic Curve 1407284663933896236729058440000

How can I calculate the y coordinate with SAGE?. Any function?

E([1407284663933896236729058440000, ??????])
sage elliptic-curve
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