[code python]
A=int(input('A'))
B=int(input('B'))
C=int(input('C'))
D=int(input('D'))
def minmax(A,B):
    return min(A,B),max(A,B)
    
print 'A=', min(A,B), 'B=', max(A,B)
def min3(A,B,C,D):
    return min(A,B,C),min(A,B,D),min(A,C,D)
print 'min(A,B,C)=',min(A,B,C),'\n','min(A,B,D)=',min(A,B,D),'\n','min(A,C,D)=',min(A,C,D)
[/code]

A = 1
B = 2
C = 3
D = 4
def minmax(A, B):
    return min(A, B), max(A, B)
def min3(A,B,C,D):
    return min(A,B,C), min(A,B,D), min(A,C,D)
print minmax(A, B)
print min3(A,B,C,D)