A paranoid friend has sent me a message, but in his paranoid mind he forgot to tell me how to decode it.
If Picasso got a computer he would know what to do!
What can I do now?

S21x10a12x10d12x11l15x14y12x15,12x12 40x14t26x14h28x16i40x16s10x15 17x13i40x10s22x10 17x15n34x14o36x13t31x15 40x12t17x10h15x15e16x13 31x16m41x16e17x16s20x12s20x14a36x15g37x14e37x10 34x12y40x11o20x15u15x11 43x10a31x14r37x13e25x16 34x11l10x14o42x14o20x13k35x12i37x12n26x13g34x16 34x13f37x15o10x16r25x12 42x13:37x11(40x15 31x13T15x16r25x13y40x13 17x11f17x12u10x12r43x16t12x13h15x12e21x16r31x11!35x11o25x14o17x14o25x11o10x13o41x10o36x14o11x13o43x14o28x10o20x10o31x10o42x10o31x12o15x10o43x13o10x10o27x11o12x14o22x16o34x15o43x15o15x13o16x10o10x11o35x13o34x10o25x15o26x12o12x16o25x10o20x16o20x11o37x16o27x15o42x16