This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <cstdio>
int main()
{
    int n,r;
    scanf("%d%d",&r,&n); n<<=1;
    int i;
    int buf; char d,b=-1;
    for(i=0;i<n;i++){
        scanf("%d %c",&buf,&d);
        if(b==d){
            printf("-1");
            return 0;
        } else b=d;
    }
    printf("%d\n",r);
    return 0;
}
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