#include<bits/stdc++.h>
using namespace std;

int main() {
    int T;
    cin >> T;
    while (T--) {
        string a, b;
        cin >> a >> b;
        int lenA = a.size();
        int lenB = b.size();
        if (abs(lenA - lenB) > 1) {
            cout << "not similar" << endl;
            continue;
        }
        int i = 0, j = 0;
        int diff = 0;
        while (i < lenA && j < lenB) {
            if (a[i] == b[j]) {
                i++;
                j++;
            } else {
                diff++;
                if (diff > 1) break;
                if (lenA == lenB) {
                    i++;
                    j++;
                } else if (lenA > lenB) {
                    i++;
                } else {
                    j++;
                }
            }
        }
        if (diff <= 1) {
            cout << "similar" << endl;
        } else {
            cout << "not similar" << endl;
        }
    }
    return 0;
}