Please tell me what these simple codes mean?

what do these mean?
Lmax=B(1,4);%Lmax is equal to the maximum value in the vector
Lmin=B(1,1);%Lmin is equal to the minimum value in the vector
La=B(1,2);%La is equal to one of the rests.
Lb=B(1,3);%Lb is equal to one of the rests.

if my inputs are 100,300,250 and 50, how will my Lmax, Lmin, La, and Lb be chosen?
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here are the inputs:

L0= 50,100,300
L1= 600,300,100
L2= 400,250,150
L3= 500,50,200

fprintf('Enter Link Length\n')
L0=input('Fixed link:');%input L0
L1=input('Shorter Side Link:');%input L1
L2=input('Coupler:');%input L2
L3=input('Longer Side link:');%input L3

A=[L0,L1,L2,L3];% arrange numbers into vector
B=sort(A);%sort numbers from min to max

Lmax=B(1,4);%Lmax is equal to the maximum
Lmin=B(1,1);%Lmin is equal to the minimum
La=B(1,2);%La is equal to one of the remainings.
Lb=B(1,3);%Lb is equal to one of the remainings.

thank you