Hello Community. I am running an automated Mathematica code which includes the following as inputs.

vars = Input["Please input variables in a list form"]
list = Input["Please input a basis in a list form"]
paramList = Input["Please input parameters in a list form"]

When I run the code, it calls vars (1st input) and I will type {t, x, u}, then click "OK". Then it calls list (2nd input) and I will type

{X1 = {1, 0, 0},
X2 = {0, 0, u},
X3 = {0, (E^(Kt) S^2)/(2 K),  E^(Kt) u (l1 + x)},
X4 = {0, E^(-Kt), -((E^(-Kt) u)/K)}, 
X5 = {-((  E^(2 Kt) S^2)/(2 K^2)), E^(2 Kt) (l2 - (x S^2)/(2 K)),  E^(2 Kt) u (l3 + l4 x - x^2)},
X6 = {-E^(-2 Kt), E^(-2 Kt) (l5 + K x), -E^(-2 Kt) u (x + S^2/(2 K^2))},

then click "OK". Then it calls paramList (3rd input), a list of parameters, and I will type {K, S, T} and click "OK". However, l1, l2, .... l5 is part of the third input, is not defined , so the code gives false outputs since l1, l2, .... l5 is not recognized.

Note: l1 = S^2/(2 K^2 - T); l2 = (S^2 (K^2 T - S^2))/(2 K^3); l3 = S^2/(2 K - l1^2); l4 = (4 K^2 T - 3 S^2)/(2 K^2); l5 = (S^2 - K^2 T)/ K;

How do I include l1, l2, .... l5 as part of 3rd input (which is a string) when I run the code ?

Ps: let me know if more information is required for a better answer.