include <iostream>

using namespace std;

int main()
{
long long x,n;
cin >> n >> x;
long long a[n];
for (int i=0;i<n;i++) { cin >> a[i];
}
long long l=0,r=n-1;
while (l<r) { if (a[l]+a[r]==x) { break; } else if (a[l]+a[r]>x)
{
r--;
}
else
{
l++;
}
}
if (l<r)
{
cout << l+1 << " " << r+1;
}
else
{
cout << "No solution";
}
return 0;
}