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Cod sursa(job #627399)
#include<cstdio>
int n, m, a[1100], b[1100], i, j, nr, v[1100];
int main()
{ freopen("cmlsc.in", "r", stdin);
freopen("cmlsc.out", "w", stdout);
scanf("%d %d", &m, &n);
for(i=1; i<=m; i++) scanf("%d ", &a[i]);
for(i=1; i<=n; i++) scanf("%d ", &b[i]);
for(i=1; i<=m; i++)
for(j=1; j<=n; j++)
if(a[i]==b[j]) { nr++;
v[nr]=a[i];
b[j]=-1;
}
printf("%d\n", nr);
for(i=1; i<=nr; i++) printf("%d ", v[i]);
return 0;
}