// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;



namespace SCC {

	const int N = 110000;

	vector<int> con[N], rcon[N];

	int n, vis[N], visT;

	int id[N], idn;

	void init(int nn = 0) {

		n = nn, visT = idn = 0;

		for (int i = 1; i <= n; i++) con[i].clear(), rcon[i].clear();

	}

	void add_edge(int u, int v) {

		con[u].push_back(v);

		rcon[v].push_back(u);

	}

	void dfs(int u) {

		vis[u] = 1;

		for (int v : con[u]) if (!vis[v]) dfs(v);

		id[idn++] = u;

	}

	void rdfs(int u) {

		vis[u] = visT;

		for (int v : rcon[u]) if (!vis[v]) rdfs(v);

	}

	void SCC() {

		for (int i = 1; i <= n; i++) vis[i] = 0;

		for (int i = 1; i <= n; i++) if (!vis[i]) dfs(i);

		for (int i = 1; i <= n; i++) vis[i] = 0;

		for (int i = idn - 1; i >= 0; i--) if (!vis[id[i]]) visT++, rdfs(id[i]);

	}

};



const int N = 1100;

const int M = 220000;



vector<int> con[N];



struct Edge {

	int u, v;

	Edge(int u = 0, int v = 0) : u(u), v(v) {}

} E[M];



int adj[N][N];

int vis[N], visT;

int son[2][N][N];



inline bool Find(int u, int tar) {

	if (adj[u][tar] > 1) return true;

	return son[0][u][tar] != tar || son[1][u][tar] != tar;

}



void dfs(int u, int id, int rt, int __rt) {

	vis[u] = visT;

	son[id][__rt][u] = rt;

	for (int v : con[u]) if (vis[v] != visT) dfs(v, id, rt, __rt);

}



void init(int n) {

	for (int i = 1; i <= n; i++) {

		visT++;

		vis[i] = visT;

		for (int v : con[i]) if (vis[v] != visT) dfs(v, 0, v, i);

		reverse(con[i].begin(), con[i].end());

		visT++;

		vis[i] = visT;

		for (int v : con[i]) if (vis[v] != visT) dfs(v, 1, v, i);

	}

}



int main() {

	

	ios::sync_with_stdio(0);

	cin.tie(0), cout.tie(0);

	

	int n, m; cin >> n >> m;

	SCC::init(n + 10);

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

		int u, v; cin >> u >> v;

		E[i] = Edge(u, v);

		con[u].push_back(v);

		adj[u][v]++;

		SCC::add_edge(u, v);

	}

	SCC::SCC();

	

	init(n);

	

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

		auto a = SCC::vis[E[i].u], b = SCC::vis[E[i].v];

		if (a == b) {

			if (Find(E[i].u, E[i].v)) cout << "same\n";

			else cout << "diff\n";

		} else {

			if (Find(E[i].u, E[i].v)) cout << "diff\n";

			else cout << "same\n";

		}

	}

	

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 9.467413669750735x):
#include<cstdio>

#include<cstring>

#include<vector>

using namespace std;

int n,m,u[210000],v[210000],tmp[1100][2];

bool ans1[1100][1100],ans2[1100][1100];

vector<int> vec[1100];

void dfs(int u,int rt){

    ans1[rt][u]=true;

    for(int i=0;i<vec[u].size();i++)

        if (!ans1[rt][vec[u][i]]) dfs(vec[u][i],rt);

}

void dfs2(int u,int num,int f){

    tmp[u][f]=num;

    for(int i=0;i<vec[u].size();i++)

        if (!tmp[vec[u][i]][f]) dfs2(vec[u][i],num,f);

}

int main(){

    scanf("%d%d",&n,&m);

    for (int i=1;i<=m;i++){

        scanf("%d%d",&u[i],&v[i]);

        vec[u[i]].push_back(v[i]);

    }

    for (int i=1;i<=n;i++) dfs(i,i);

    for (int i=1;i<=n;i++){

        memset(tmp,0,sizeof(tmp));

        tmp[i][0]=-1; tmp[i][1]=-1;

        for (int j=0;j<vec[i].size();j++)

            if (!tmp[vec[i][j]][0]) dfs2(vec[i][j],j+1,0);

        for (int j=vec[i].size()-1;j>=0;j--)

            if (!tmp[vec[i][j]][1]) dfs2(vec[i][j],j+1,1);

        for (int j=0;j<vec[i].size();j++)

            if (tmp[vec[i][j]][0]!=j+1||tmp[vec[i][j]][1]!=j+1) ans2[i][vec[i][j]]=true;

    }

    for (int i=1;i<=m;i++)

        if (ans1[v[i]][u[i]]==ans2[u[i]][v[i]]) puts("same");

        else puts("diff");

    

    return 0;

}