#50146: python短解
id={'A': [1, 0],'B': [1, 1],'C': [1, 2],'D': [1, 3],
'E': [1, 4],'F': [1, 5],'G': [1, 6],'H': [1, 7],
'I': [3, 4],'J': [1, 8],'K': [1, 9],'L': [2, 0],
'M': [2, 1],'N': [2, 2],'O': [3, 5],'P': [2, 3],
'Q': [2, 4],'R': [2, 5],'S': [2, 6],'T': [2, 7],
'U': [2, 8],'V': [2, 9],'W': [3, 2],'X': [3, 0],
'Y': [3, 1],'Z': [3, 3]}
a=list(map(int,input()))
for y,(o,j) in id.items():
s=(o+j*9)
n=8
for i in a[0:8]:
s+=(i*n)
n-=1
b=(10 - (s % 10))%10
if b==a[-1]:
print(y,end='')