#include<stdio.h>
#define maxn 1000 + 5
#define maxk 100 + 5
long n,m,i,j,k,l;
long o[maxn];
long u[maxk];
long e[maxk][2][maxk];
long w[maxn];
long x,y;
long ans;
long r;
char c;
int main()
{/*
 freopen("in.txt","r",stdin);
 freopen("out.txt","w",stdout);*/
 scanf("%ld%ld",&n,&m);
 k=0;
 for(i=1;i<=m;i++)
   {
	k++;
    scanf("%ld",&u[k]);
    for(j=1;j<=u[k];j++)scanf("%ld",&e[k][0][j]);
    for(j=1;j<=u[k];j++)scanf("%ld",&e[k][1][j]);
    c=getchar();
    c=getchar();
    if(c=='='){for(j=1;j<=u[k];j++)o[e[k][0][j]]=o[e[k][1][j]]=1;k--;}
    else
      if(c=='>')
        for(j=1;j<=u[k];j++)
          {l=e[k][0][j];
           e[k][0][j]=e[k][1][j];
           e[k][1][j]=l;}
   }
  m=k;
  for(i=1;i<=n;w[i]=0,i++)
   for(k=1;k<=2;k++)
	if(!o[i])
	{
	 if(k==1)w[i]=-1;
	 else    w[i]=1;
	 for(j=1;j<=m;j++)
	  {
	   x=y=0; 
	   for(l=1;l<=u[j];l++)
	   {x+=w[e[j][0][l]];
		y+=w[e[j][1][l]];}
	   if(x>=y)break;
	  }
	 if(j>m)
	   {ans=i;r++;}
    }
 if(r>1)ans=0;
 printf("%ld\n",ans);
 return(0);
}

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