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#include <cstdio>

#include <iostream>

using namespace std;

int main() {

int n, v;

cin >> n >> v;

int ans[n];

int idx = 0;

for (int i = 0; i < n; ++i) {

int k;

cin >> k;

bool isFound = false;

for (int j = 0; j < k; ++j) {

int tmp;

cin >> tmp;

if (!isFound && tmp < v) {

ans[idx++] = i+1;

isFound = true;

}

}

}

cout << idx << endl;

for (int i = 0; i < idx; ++i) {

cout << ans[i] << " ";

}

return 0;

}