local ffi = require 'ffi'
local M = ffi.load 'ssl'
ffi.cdef [[
typedef struct bignum_st {
	uint64_t *d;
	int top;
	int dmax;
	int neg;
	int flags;
} BN;
typedef BN * BN_ptr;
typedef const BN * BN_srcptr;

BN_ptr BN_new(void);
void BN_free(BN_ptr);
int BN_set_word(BN_ptr, uint64_t);

int BN_dec2bn(BN_ptr *, const char *);
char * BN_bn2dec(BN_srcptr);
void CRYPTO_free(void *, const char *, int);

typedef struct bignum_pool_item {
	BN vals[16];
	struct bignum_pool_item *prev, *next;
} BN_POOL_ITEM;
typedef struct bignum_pool {
	BN_POOL_ITEM *head, *current, *tail;
	unsigned used, size;
} BN_POOL;
typedef struct bignum_ctx_stack {
	unsigned int *indexes;
	unsigned int depth, size;
} BN_STACK;
typedef struct bignum_ctx {
	BN_POOL pool;
	BN_STACK stack;
	unsigned int used;
	int err_stack;
	int too_many;
	int flags;
} BN_CTX;
typedef BN_CTX * BN_CTX_ptr;

BN_CTX_ptr BN_CTX_new(void);
void BN_CTX_free(BN_CTX_ptr);
int BN_mod_exp(BN_ptr, BN_srcptr, BN_srcptr, BN_srcptr, BN_CTX_ptr);
]]
local ct = ffi.typeof 'BN_ptr[1]'

print((function (n, m)
	local r,mod,ctx=ffi.gc(M.BN_new(),M.BN_free),ffi.gc(M.BN_new(),M.BN_free),ffi.gc(M.BN_CTX_new(),M.BN_CTX_free)
	M.BN_dec2bn(n,io.stdin:read("*l"))
	M.BN_dec2bn(m,io.stdin:read("*l"))
	M.BN_set_word(mod,10ULL)
	M.BN_mod_exp(r, n[0], m[0], mod, ctx)
	return ffi.string(ffi.gc(M.BN_bn2dec(r),function (a) M.CRYPTO_free(a,"",0) end))
end)(ct(), ct()))