Input sequence contained in an array

Input sequence contained in an array

I'm trying to implement this excercise but it doesn't work very well. It
should tell me if the sequence in array B is contained in A. Any ideas? I
have a problem getting it to work for every sequence.
#include <stdio.h>
#include <stdlib.h>
#define N 6
#define M 3
int contains(int v[], int n);
/*
*
*/
int main(int argc, char** argv)
{
int A[N], B[M];
int i, j = 0, flag = 0, contained = 1;
printf("Array A\n");
for (i = 0; i < N; i++)
{
printf("Insert element: ");
scanf("%d", &A[i]);
}
printf("Array B\n");
for (i = 0; i < M; i++)
{
printf("Insert element: ");
scanf("%d", &B[i]);
}
for (i = 0; i < (N - M + 1); i++)
{
flag = 0;
if (A[i] == B[j])
{
flag = 1;
j++;
}
if (flag == 0 && (i == N-M))
{
contained = 0;
printf("The sequence B is not contained in A!\n");
break;
}
}
if (contained == 1)
{
printf("The sequence B is contained in A\n");
}
return (EXIT_SUCCESS);
}