e=[]

z=[]

e=[a[0],a[1]]

a=int(a[2])

x=0

for i in range(a):

a=input().split()

e.append(a)

print(e)

x1=int(e[0])

y1=int(e[1])

x2=int(e[2])

y2=int(e[3])

for i in x:

if x2-x1>0:

z.append("D")

x1=x2

y1=y2

y2=y2+2

x2=x2+2

elif x1-x2<0:

z.append("I")

x1=x2

y1=y2

y2=y2+2

x2=x2+2

if y2-y1<0:

z.append("B")

x1=x2

y1=y2

y2=y2+2

x2=x2+2

if y2-y1>0:

z.append("A")

x1=x2

y1=y2

y2=y2+2

x2=x2+2

else:

x1=x2

y1=y2

y2=y2+2

x2=x2+2

print(z)