A bank was stolen and four people, A, B, C and Ding, were detained for trial  The detection results show that the criminal is one of them  A said, C stole it  B said, I didn't steal it  C said, I didn't steal it either  D said,'if B didn't steal it, then I stole it
it has been found out that only one of them is telling lies
It was D who stole the bank.