a1 = 'a1'
a2 = 'a2'
a3 = 'a3'
b1 = 'b1'
b2 = 'b2'
b3 = 'b3'
c1 = 'c1'
c2 = 'c2'
c3 = 'c3'
d1 = 'd1'
d2 = 'd2'
d3 = 'd3'
e1 = 'e1'
e2 = 'e2'
e3 = 'e3'
f1 = 'f1'
f2 = 'f2'
f3 = 'f3'
mat = [[[a1, a2, a3] , [b1, b2, b3] , [c1, c2, c3]], [[d1, d2, d3] , [e1, e2, e3] , [f1, f2, f3]]]
print(mat[1][1][2])
YTEgPSAnYTEnCmEyID0gJ2EyJwphMyA9ICdhMycKYjEgPSAnYjEnCmIyID0gJ2IyJwpiMyA9ICdiMycKYzEgPSAnYzEnCmMyID0gJ2MyJyAKYzMgPSAnYzMnCmQxID0gJ2QxJwpkMiA9ICdkMicKZDMgPSAnZDMnCmUxID0gJ2UxJwplMiA9ICdlMicKZTMgPSAnZTMnCmYxID0gJ2YxJwpmMiA9ICdmMicgCmYzID0gJ2YzJwptYXQgPSBbW1thMSwgYTIsIGEzXSAgLCBbYjEsIGIyLCBiM10gLCBbYzEsIGMyLCBjM11dLCBbW2QxLCBkMiwgZDNdICAsIFtlMSwgZTIsIGUzXSAsIFtmMSwgZjIsIGYzXV1dCgpwcmludChtYXRbMV1bMV1bMl0p